Physics 0625 · IGCSE · The nuclear model of the atom

The nuclear model of the atom — practice question

A nucleus of element $X$ is written as $^{56}_{26}X$. Which of the following is an isotope of element $X$?

  • A$^{26}_{56}X$
  • B$^{54}_{26}X$
  • C$^{56}_{24}X$
  • D$^{54}_{28}X$

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